Python curses.error() Examples

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except Exception:
                # guess false in case of error
                return False 

def addstr(self, y, x, msg, color = None, attr = curses.A_NORMAL):
    # Curses throws an error if we try to draw a message that spans out of the
    # window's bounds (... seriously?), so doing our best to avoid that.

    if color is not None:
      if color not in self._colors:
        recognized_colors = ", ".join(self._colors.keys())
        raise ValueError("The '%s' color isn't recognized: %s" % (color, recognized_colors))

      attr |= self._colors[color]

    max_y, max_x = self._stdscr.getmaxyx()

    if max_x > x and max_y > y:
      try:
        self._stdscr.addstr(y, x, msg[:max_x - x], attr)
      except:
        pass  # maybe an edge case while resizing the window 

def supported(cls, stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True 

def refresh_window(procs, disks_read, disks_write):
    """Print results on screen by using curses."""
    curses.endwin()
    templ = "%-5s %-7s %11s %11s  %s"
    win.erase()

    disks_tot = "Total DISK READ: %s | Total DISK WRITE: %s" \
                % (bytes2human(disks_read), bytes2human(disks_write))
    print_line(disks_tot)

    header = templ % ("PID", "USER", "DISK READ", "DISK WRITE", "COMMAND")
    print_line(header, highlight=True)

    for p in procs:
        line = templ % (
            p.pid,
            p._username[:7],
            bytes2human(p._read_per_sec),
            bytes2human(p._write_per_sec),
            p._cmdline)
        try:
            print_line(line)
        except curses.error:
            break
    win.refresh() 

def supported(cls, stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True 

def supported(cls, stream=sys.stdout):
        """Check the current platform supports coloring terminal output

        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except Exception:
                # guess false in case of error
                return False 

def _insert_printable_char(self, ch):
        self._update_max_yx()
        (y, x) = self.win.getyx()
        backyx = None
        while y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if not self.insert_mode or not curses.ascii.isprint(oldch):
                break
            ch = oldch
            (y, x) = self.win.getyx()
            # Remember where to put the cursor back since we are in insert_mode
            if backyx is None:
                backyx = y, x

        if backyx is not None:
            self.win.move(*backyx) 

def print_line(line, highlight=False):
    """A thin wrapper around curses's addstr()."""
    global lineno
    try:
        if highlight:
            line += " " * (win.getmaxyx()[1] - len(line))
            win.addstr(lineno, 0, line, curses.A_REVERSE)
        else:
            win.addstr(lineno, 0, line, 0)
    except curses.error:
        lineno = 0
        win.refresh()
        raise
    else:
        lineno += 1

# --- /curses stuff 

def _insert_printable_char(self, ch):
        (y, x) = self.win.getyx()
        if y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if self.insert_mode:
                (backy, backx) = self.win.getyx()
                if curses.ascii.isprint(oldch):
                    self._insert_printable_char(oldch)
                    self.win.move(backy, backx) 

def _insert_printable_char(self, ch):
        (y, x) = self.win.getyx()
        if y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if self.insert_mode:
                (backy, backx) = self.win.getyx()
                if curses.ascii.isprint(oldch):
                    self._insert_printable_char(oldch)
                    self.win.move(backy, backx) 

def _printResults(self, flavor, errors, formatter):
        """
        Print a group of errors to the stream.

        @param flavor: A string indicating the kind of error (e.g. 'TODO').
        @param errors: A list of errors, often L{failure.Failure}s, but
            sometimes 'todo' errors.
        @param formatter: A callable that knows how to format the errors.
        """
        for reason, cases in self._groupResults(errors, formatter):
            self._writeln(self._doubleSeparator)
            self._writeln(flavor)
            self._write(reason)
            self._writeln('')
            for case in cases:
                self._writeln(case.id()) 

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                # guess false in case of error
                return False 

def test_tparm_returns_null(monkeypatch):
    """ Test 'tparm() returned NULL' is caught (win32 PDCurses systems). """
    # on win32, any calls to tparm raises curses.error with message,
    # "tparm() returned NULL", function PyCurses_tparm of _cursesmodule.c
    from blessed.formatters import ParameterizingString, NullCallableString

    def tparm(*args):
        raise curses.error("tparm() returned NULL")

    monkeypatch.setattr(curses, 'tparm', tparm)

    term = mock.Mock()
    term.normal = 'seq-normal'

    pstr = ParameterizingString(u'cap', u'norm', u'seq-name')

    value = pstr(u'x')
    assert type(value) is NullCallableString 

def test_tparm_other_exception(monkeypatch):
    """ Test 'tparm() returned NULL' is caught (win32 PDCurses systems). """
    # on win32, any calls to tparm raises curses.error with message,
    # "tparm() returned NULL", function PyCurses_tparm of _cursesmodule.c
    from blessed.formatters import ParameterizingString, NullCallableString

    def tparm(*args):
        raise curses.error("unexpected error in tparm()")

    monkeypatch.setattr(curses, 'tparm', tparm)

    term = mock.Mock()
    term.normal = 'seq-normal'

    pstr = ParameterizingString(u'cap', u'norm', u'seq-name')

    try:
        pstr(u'x')
        assert False, "previous call should have raised curses.error"
    except curses.error:
        pass 

def _get_key_py33(self):
        """Python 3.3+ implementation of get_key."""
        # pylint: disable=too-many-return-statements
        try:
            # Curses in Python 3.3 handles unicode via get_wch
            key = self.window.get_wch()
            if isinstance(key, int):
                if key == curses.KEY_BACKSPACE:
                    return "KEY_BACKSPACE"
                if key == curses.KEY_LEFT:
                    return "KEY_LEFT"
                if key == curses.KEY_RIGHT:
                    return "KEY_RIGHT"
                if key == curses.KEY_RESIZE:
                    return "KEY_RESIZE"
                return None
            return key
        except curses.error:
            return None
        except KeyboardInterrupt:
            raise 

def refresh(self):
        pmfuncs.hide_cursor()
        _my, _mx = self._max_physical()
        self.curses_pad.move(0,0)
        
        # Since we can have pannels larger than the screen
        # let's allow for scrolling them
        
        # Getting strange errors on OS X, with curses sometimes crashing at this point. 
        # Suspect screen size not updated in time. This try: seems to solve it with no ill effects.
        try:
            self.curses_pad.refresh(self.show_from_y,self.show_from_x,self.show_aty,self.show_atx,_my,_mx)
        except curses.error:
            pass
        if self.show_from_y is 0 and \
        self.show_from_x is 0 and \
        (_my >= self.lines) and \
        (_mx >= self.columns):
            self.ALL_SHOWN = True

        else:
            self.ALL_SHOWN = False 

def IO_safe(func, *args, _tries=5, _raise=True, **kwargs):
    """ Wrapper calling function func with arguments args and keyword arguments kwargs to catch input/output errors
        on cluster.
    :param func: function to execute (intended to be read/write operation to a problematic cluster drive, but can be
        any function).
    :param args: positional args of func.
    :param kwargs: kw args of func.
    :param _tries: how many attempts to make executing func.
    """
    for _try in range(_tries):
        try:
            return func(*args, **kwargs)
        except OSError as e:  # to catch cluster issues with network drives
            if _raise:
                raise e
            else:
                print("After attempting execution {} time{}, following error occurred:\n{}".format(_try + 1,
                                                                                                   "" if _try == 0 else "s",
                                                                                                   e))
                continue 

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                raise
                # guess false in case of error
                return False 

def supported(stream=sys.stdout):
        """
        A method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except Exception:
                # guess false in case of error
                return False 

def supported(stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True 

def _insert_printable_char(self, ch):
        (y, x) = self.win.getyx()
        if y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if self.insert_mode:
                (backy, backx) = self.win.getyx()
                if curses.ascii.isprint(oldch):
                    self._insert_printable_char(oldch)
                    self.win.move(backy, backx) 

def _insert_printable_char(self, ch):
        self._update_max_yx()
        (y, x) = self.win.getyx()
        backyx = None
        while y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if not self.insert_mode or not curses.ascii.isprint(oldch):
                break
            ch = oldch
            (y, x) = self.win.getyx()
            # Remember where to put the cursor back since we are in insert_mode
            if backyx is None:
                backyx = y, x

        if backyx is not None:
            self.win.move(*backyx) 

def _printResults(self, flavor, errors, formatter):
        """
        Print a group of errors to the stream.

        @param flavor: A string indicating the kind of error (e.g. 'TODO').
        @param errors: A list of errors, often L{failure.Failure}s, but
            sometimes 'todo' errors.
        @param formatter: A callable that knows how to format the errors.
        """
        for reason, cases in self._groupResults(errors, formatter):
            self._writeln(self._doubleSeparator)
            self._writeln(flavor)
            self._write(reason)
            self._writeln('')
            for case in cases:
                self._writeln(case.id()) 

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                # guess false in case of error
                return False 

def supported(stream=sys.stdout):
        """Method that checks if the current terminal supports coloring.

        Returns True or False.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except Exception:
                # guess false in case of error
                return False 

def supported(stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True 

def _insert_printable_char(self, ch):
        (y, x) = self.win.getyx()
        if y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if self.insert_mode:
                (backy, backx) = self.win.getyx()
                if curses.ascii.isprint(oldch):
                    self._insert_printable_char(oldch)
                    self.win.move(backy, backx) 

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                # guess false in case of error
                return False 

def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                raise
                # guess false in case of error
                return False 

def _getFailure(self, error):
        """
        Convert a C{sys.exc_info()}-style tuple to a L{Failure}, if necessary.
        """
        if isinstance(error, tuple):
            return Failure(error[1], error[0], error[2])
        return error